we don't use 730 at all ?!Absolute uncertainty should be ln770 - ln750 and take it to 1 sig figure.
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we don't use 730 at all ?!Absolute uncertainty should be ln770 - ln750 and take it to 1 sig figure.
this might help.How to calculate absolute uncertainties for divisions?
Example, formula = d/v
V is 10 ± 1
D is 13 ± 0.5
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s05_qp_1.pdf
Q7,9,20,22,24,25,27,33.... Please
can some one tell me how to know that this thing is independent variable and dependent mostly in q1 asked
Don't have time will help with 4 .
Just use SI units of the axes.
Power x time
Js^-1 * s
J = joules
There is only one answer for energy so it's A.
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s05_qp_1.pdf
Q7,9,20,22,24,25,27,33.... Please
Please anyone solve for me.The image is blurred sorry for that. Thanks a lot in advance.
You are life saver! thanksFrom the diagram, we can see that resistors A and B are connected to each other in series. Therefore, their total resistance R(A+B) is equal to R + R = 2R.
Furthermore, together they are connected in parallel to D, so 1/R(A+B+D) = 1/(2R) + 1/(R) = 1/(2R) + 2/(2R) = 3/(2R)
Therefore, R(A+B+D) = 2R/3.
This resistance, R(A+B+D) is connected in a series arrangement to resistor C, so their total resistance R(A+B+C+D) = (2R)/3 + R = (2R + 3R)/3 = 5R/3
This overall is connected in parallel to resistor E, so the resistance R(A+B+C+D+E) is given by
1/R(A+B+C+D+E) = 1/R(A+B+C+D) + 1/R(E) = 3/(5R) + 1/R = 3/(5R) + 5/(5R) = 8/(5R)
Therefore, R(A+B+C+D+E) = 5R/8 ==> C.
Hope this helped!
Good Luck for all your exams!
(D) Workdone = force(F) x displacement(x) hence, x = W/f
Thanks a lotQ7)
The relationship needed for this question is the vector relationship F(net) = ma.
This equation tells us that the acceleration of a body is in the same direction as the vector representing the Net Force on that object. The magnitude of this
acceleration is given by F/m. Since the force on the ball is always downwards (the force of gravity, no other force acts on the ball) the acceleration is always downwards too. So, since the question tells us to use the upwards direction as the positive direction, the acceleration is always negative. This acceleration has a magnitude of (mg)/m = 9.81 ms^-2.
Therefore, the only option that has both a constant acceleration in the negative direction and a magnitude of 9.81 ms^-2 is B.
Q9)
We can either eliminate the wrong options, or immediately arrive at the right answer here:
At any point on the trajectory, the object's velocity is along the tangent to that point. So, at the highest point of it's trajectory, the tangent is perfectly horizontal and implies the object has some sort of horizontal velocity.
So, since the object is still moving at the highest point of it's trajectory (it is moving only in the horizontal direction as established above) it has both momentum (in the horizontal direction) and kinetic energy, so the last two options are eliminated. Furthermore, since we have already established that the object is moving in the horizontal direction, B cannot be right. Therefore, A has to be right.
Alternatively, if we apply Newton's Second Law here, F(net) = ma we can see that the only force on the object is in the vertical direction (gravity, exerting a downwards force). Therefore, since there is no force acting on the object that has a component in the horizontal direction, the component of acceleration in the horizontal direction will also be zero, therefore we get A.
I'll finish off the other questions in some time, when i'm free.
Hope this helped!
Good Luck for all your exams!
Thanks but in q22 How to cancel values ? ( I am very very weak )Q20) Suppose you attach two springs in series (i.e. the ends contact each other) and attach a load to the bottom spring, both springs (assuming their masses are negligible) will display the same extension - the extension of one of these connected springs will be equal to the extension of that spring as if the entire load had been applied on it.
Therefore, the total extension of two springs in series with any load is twice the extension of a single one of those springs (if their spring constants are the same) if the same load had been attached to it.
What you can say here is that since the extension is doubled, the spring-constant for the overall setup is half that of a single spring. For example, suppose you connect two springs with spring constant k in series, the combination will have a spring constant of k/2, i.e. it will be more flexible than a single one of the connected springs. The exact rule here is like connecting resistors in parallel, i.e. 1/k(combination) = 1/k + 1/k = 2/k so k(combination) = k/2.
Suppose you connect the same two springs in parallel, like in arrangement X, then the load is shared among them, so the total extension is half the extension is only one spring had supported the same load. Therefore, if two springs of constant k each are connected in parallel, the combination will have a spring constant of 2k, since they are equivalent to a single, stiff spring.
So, taking this up for the three diagrams X, Y and Z, we find out the equivalent spring constants for each combination (since the load on each is the same, the combination with the highest spring constant will display the least extension):
For X: Since two springs are connected in parallel, their equivalent spring constant is k + k = 2k.
For Y: Since four springs are connected with pairs of two being paired up, and these two parallel branches connected in series to each other, we know that each pair of two has a spring-constant of 2k. Further, 1/k(combination) = 1/(2k) + 1/(2k) = 1/k so that k(combination) = k. (this setup is equivalent to a single spring)
For Z: Three springs are connected; one spring is connected in series to two springs connected in parallel to each other. Therefore, the upper two springs together have a spring constant of 2k. Adding this and the lower single spring in series, we see that 1/k(combination) = 1/(2k) + 1/k = 3/(2k), so that k(combination) = (2k)/3.
Therefore, the smallest extension will be found for setup X (largest spring constant ==> smallest extension) and the next smallest extension will be found for Y. Therefore, the largest extension will be found for setup Z. So the answer is A.
Q22)
Both wires obey Hooke's Law - this is important, since it means they also obey the formula of Young's Modulus, which we can apply as follows:
Since both wires are made of the same material, they have the same value of Young's Modulus (Y).
Since both wires have the same extension, they have the same value of e in the formula Y = Fl/Ae (Or Fl/Ax , whichever one you prefer).
Therefore, we can equate their extensions and cancel out the value of Y or equate the values of Y and cancel out the value of e. Let's do the former.
So, for P: (Tension in P) * l / AY = extension
And for Q: (Tension in Q) * (2l) / (A/2)Y = extension
So (Tension in P) * l / AY = (Tension in Q) *2l/ (A/2)Y
Cancelling out values on both sides,
(Tension in P) * 1 = 4 * (Tension in Q)
So that (Tension in P)/(Tension in Q) = 4/1 = D.
Q24) This concerns values you need to keep in memory unless they are on the data sheets, i'm not sure. Either ways, visible light falls in the range of
400 nm< λ < 700 nm. We can take any value in this range to represent out wavelength. Suppose we take 600 nm.
Then, the number of wavelengths in 1 meter = 1 / (600 * 10^-9) = 1.6667 * 10^6. So our answer is closest to B. Therefore, that's our answer.
I'll post the rest after some more time, have some work I need to finish off
Hope this helped!
Good Luck for all of your exams!
Any Idea about Paper 51 todayGuyssss plz heeeelpp , how to find v and the uncertainty of v^2 in Q2 ????
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_53.pdf
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